<template>
  <div>
    <div id="root">
      <div class="todo-container">
        <div class="todo-wrap">
          <MyHeader @addTodo="addTodo"/>
          <MyList :todos="todos"/>
          <MyFooter :todos="todos" @removeChecked="removedChecked" @checkedAll="checkedAll"/>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import pubsub from "pubsub-js"

import MyHeader from "./components/MyHeader";
import MyList from "./components/MyList";
import MyFooter from "./components/MyFooter";


export default {
  name: "App",
  components: {MyHeader, MyList, MyFooter},
  data() {
    return {
      todos: JSON.parse(localStorage.getItem('todos')) || []
    }
  },
  watch: {
    todos: {
      handler(){
        localStorage.setItem('todos',JSON.stringify(this.todos))
      },
      deep:true
    }
  },
  methods: {
    addTodo(x) {
      this.todos.unshift(x)
    },
    checkTodo(id) {
      this.todos.forEach((todo) => {
        if (todo.id === id) {
          todo.done = !todo.done
        }
      })
    },
    removeTodo(_,id) {
      if (confirm('确定删除吗？')) {
        this.todos = this.todos.filter(todo => todo.id != id)
      }
    },
    checkedAll(isChecked) {
      this.todos.forEach(todo => todo.done = isChecked)
    },
    removedChecked() {
      this.todos = this.todos.filter(todo => !todo.done)
    }
  },
  mounted() {
    this.$bus.$on('checkTodo',this.checkTodo)
    this.pubId = pubsub.subscribe('removeTodo',this.removeTodo)
  },
  beforeDestroy() {
    this.$bus.$off('checkTodo')
    pubsub.unsubscribe(this.pubId)
  }

}
</script>

<style>
/*base*/
body {
  background: #fff;
}

.btn {
  display: inline-block;
  padding: 4px 12px;
  margin-bottom: 0;
  font-size: 14px;
  line-height: 20px;
  text-align: center;
  vertical-align: middle;
  cursor: pointer;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 1px 2px rgba(0, 0, 0, 0.05);
  border-radius: 4px;
}

.btn-danger {
  color: #fff;
  background-color: #da4f49;
  border: 1px solid #bd362f;
}

.btn-danger:hover {
  color: #fff;
  background-color: #bd362f;
}

.btn:focus {
  outline: none;
}

.todo-container {
  width: 600px;
  margin: 0 auto;
}

.todo-container .todo-wrap {
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 5px;
}


</style>